(b) Number
of molecules of
(c) Number
of atoms of nitrogen.
Or
A vessel
contains 5.6 grams of gas.
Calculate the number
of moles of gas, number of nitrogen
molecules and number of nitrogen atoms if the atomic mass of
and 
per
mole.
Answer:
(a) 1
molecule of hydrogen gas contains 2 atoms of hydrogen
1 dozen of 
molecules = 24 atoms of H
6.022 x 1023
molecules of Ha =1 mol
12 molecules
of
moles
6.022 x1023
= 1.99 x10-23 moles
(b) Hydrogen
: Oxygen (by mass)= 1: 8
= 2 g : 16
got oxygen
1 mole of combines with
mole of oxygen 
mole combines with oxygen 
moles = 2 : 1
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